题目内容
计算下面各题.
1-
|
|
| ||||||||||||||||
6-(
|
|
|
考点:分数的加法和减法
专题:运算顺序及法则
分析:①②⑤按从左到右的顺序通分计算;
③④按照先算小括号内的,再算括号外的顺序计算即可;
⑥先去掉括号,再运用加法交换律简算即可.
③④按照先算小括号内的,再算括号外的顺序计算即可;
⑥先去掉括号,再运用加法交换律简算即可.
解答:
解:
②
-
+
=
-
+
=
;
③
-(
+
)
=
-
=
-
=
;
④6-(
-
)
=6-(
-
)
=6-
=5
;
⑤
+
-
=
+
-
=
;
⑥
+(5-
)
=
-
+5
=5.
①1-
=
=
|
| 3 |
| 4 |
| 5 |
| 8 |
| 5 |
| 6 |
=
| 18 |
| 24 |
| 15 |
| 24 |
| 20 |
| 24 |
=
| 23 |
| 24 |
③
| 7 |
| 9 |
| 1 |
| 4 |
| 1 |
| 2 |
=
| 7 |
| 9 |
| 3 |
| 4 |
=
| 28 |
| 36 |
| 27 |
| 36 |
=
| 1 |
| 36 |
④6-(
| 6 |
| 5 |
| 3 |
| 4 |
=6-(
| 24 |
| 20 |
| 15 |
| 20 |
=6-
| 9 |
| 20 |
=5
| 11 |
| 20 |
⑤
| 3 |
| 5 |
| 7 |
| 15 |
| 3 |
| 4 |
=
| 36 |
| 60 |
| 28 |
| 60 |
| 45 |
| 60 |
=
| 19 |
| 60 |
⑥
| 3 |
| 7 |
| 3 |
| 7 |
=
| 3 |
| 7 |
| 3 |
| 7 |
=5.
点评:此题考查了异分母分数加减法的计算法则的运用,注意通分要正确.
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